Engineering Materials Practice Set-8

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1. Compressive strength of grey cast iron in tonnes/cm is of the order of

35

1015

710

57

2. The machinability of steel is increased by

Silicon and sulphur

Sulphur, graphite and aluminium

Phosphorous, lead and sulphur

Phosphorous and aluminium

3. The alloying element which reduces the formation of iron sulphide in steel is

Vanadium

Nickel

Manganese

Chromium

4. Sulphur in cast iron

Increases hardness and brittleness

Make the iron white and hard

Makes the iron soft and easily machinable

Aids fusibility and fluidity

5. Cold rolled steel sheets contain carbon of the following order

0.4%

0.1%

0.6%

0.2%

6. Bronze contains

85 - 92% copper and rest tin with little lead and nickel

70% copper and 30% zinc

90% copper and 10% tin

70 - 75% copper and rest tin

7. Which of the following is used for bearing liner?

Babbitt metal

Gun metal

Bronze

Bell metal

8. Nimonic contains __________ percentage of nickel as that of Inconel.

None of these

Less

Same

More

9. An example of amorphous material is

Zinc

Lead

Glass

Silver

10. Beryllium bronze has

(A) High yield point

(C) Both (A) and (B)

(D) None of these

(B) High fatigue limit

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11. Free cutting steels

Contain carbon in free form

Do not exist

Require least cutting force

Are used where ease in machining is the criterion

12. The alloy used for making electrical resistances and heating elements is

Nichrome

Invar

Elinvar

Magnin

13. Corrosion resistance of steel is increased by adding

Tungsten and sulphur

Chromium and nickel

Aluminium and zinc

Nickel and molybdenum

14. Connecting rod is usually made of

Medium carbon steel

High carbon steel

Low carbon steel

Aluminium

15. Melting point of iron is

1601°C

1489°C

1539°C

1712°C

16. High carbon steel carries carbon percentage

0.6 to 0.8%

0.8 to 1.5%

0.1 to 0.3%

0.3 to 0.6%

17. Steel made from phosphate iron is

Ductile

Hard

Tough

Brittle

18. Perminvar alloy having constant permeability is an alloy of

Copper, nickel and antimony

Nickel, copper and iron

Iron, zinc and bismuth

Nickel, copper and zinc

19. Which is false statement about tempering? Tempering is done to

Improve toughness

Release stresses

Improve machinability

Improve ductility

20. Drop forging dies contain carbon of the order of

0.7 to 0.9%

0.6 to 0.7%

0.25 to 0.5%

0.1 to 0.2%

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21. Permalloy is a

None ferrous alloy

Kind of stainless steel

Nickel and iron alloy having high permeability

Polymer

22. Carbon in iron is an example of

Intermetallic compounds

All of the above

Substitutional solution

Interstitial solid solution

23. Hardness of upper bainite (acicular structure) is about

RC 80

RC 48

RC 65

RC 57

24. Gun metal contains

70 - 78% copper and rest tin

90% copper and 10% tin

70% copper and 30% zinc

85 - 92% copper and rest tin with little lead and nickel

25. Phosphor bronze contains

1% phosphorous

None of the above

2.5% phosphorous

0.5% of phosphorous

26. Chromium in steel

Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

Improves wear resistance, cutting ability and toughness

Gives ductility, toughness, tensile strength and anti-corrosion properties

Improves cutting ability and reduces hardenability

27. Which of the following is the binding material in cemented carbides?

Nickel

Vanadium

Iron

Cobalt

28. Preheating is essential in welding

Cast iron

All nonferrous materials

High speed steel

All of the above

29. Shock resisting steels should have

Toughness

Low wear resistance

Low hardness

Low tensile strength

30. The hardness is the property of a material due to which it

Can be drawn into wires

Can be rolled or hammered into thin sheets

Can cut another metal

Breaks with little permanent distortion

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31. Aluminium bronze contains aluminium and copper in the ratio of

40 : 60

10 : 90

60 : 40

50 : 50

32. Weld decay is the phenomenon found with

Stainless steel

Mild steel

Nonferrous materials

Cast iron

33. The hardness of steel increases if it contains

Austenite

Pearlite

Cementite

Martensite

34. Cupola produces following material

Malleable iron

Wrought iron

Pig iron

Cast iron

35. Delta metal is an alloy of

Iron, aluminium and magnesium

Copper, zinc and iron

Iron, nickel and copper

Iron, lead and tin

36. The crystal structure of brass is

Orthorhombic crystalline structure

F.C.C.

H.C.P.

B.C.C.

37. Manganese in steel increases its

Ductility

Fluidity

Hardness

Tensile strength

38. Argentite is the principal ore or raw material for

Silver

Tin

Aluminium

Zinc

39. The presence of sulphur in pig iron makes

It easily machinable

It hard

The casting unsound

It brittle

40. Tungsten in high speed steel provides

Sharp cutting edge

Toughness

Wear resistance

Hot hardness

Engineering Materials Practice Set-8

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